Flat
Flat adjective - Lacking in qualities that make for spirit and character.
Usage example: a dull, flat person who couldn't come up with an original idea to save her life
Weak is a synonym for flat in character trait topic. In some cases you can use "Weak" instead an adjective "Flat", when it comes to topics like dull, without energy.
Weak
Weak adjective - Lacking bodily strength.
Both words in one sentence
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If an enemy is weak enough, you can even just flat-out kill it on the field by repeatedly attacking it.
Source: Video Game / Indivisible - They're pathetically weak and have no armor whatsoever, so any weapon at all will kill them in one shot - as will simply stomping them flat.
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It has a Breath Weapon with a flat 50% chance (or higher) to shunt you into an Alternate Universe, power over probability, and an aura of 'Unknowing' which can even cause the universe to forget you if you're weak enough.
Cite this Source
Weak and Flat. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/flat/weak
Flat & Weak. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/flat/weak>.
Weak or Flat. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/flat/weak.
Google Ngram Viewer shows how "flat" and "weak" have occurred on timeline